Loran-C is interesting (thanks for sharing, I hadn't heard of that before), but it sure doesn't look global. As of 1992, it extended to: USA, Greenland and the

Loran-C is interesting (thanks for sharing, I hadn't heard of that before), but it sure doesn't look global. As of 1992, it extended to: USA, Greenland and the Mediterranean[1]. SR systems that had vocabularies of low double digit words don't seem particularly comparable to modern systems. Also, I think you might be out-of-date on what modern systems look like - your description does not match my experience with production SR system whatsoever. I never dismissed antibiotics. They absolutely changed the world, I am in no way disagreeing with that. I took issue with your claim that they "effectively ended infectious disease as a public health problem". My entire family works in epidemiology/public health for infectious diseases and that statement is just pure crap. You would be hard-pressed to find a single person in the entire field who would agree with you. [1] https://www.loran.org/otherarchives/1992%20Loran-C%20User%20Handbook%20-%20USCG.pdf https://www.loran.org/otherarchives/1992%20Loran-C%20User%20.... Appendix B, coverage diagrams